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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-12-29 14:27:32 -0500
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-12-29 14:27:32 -0500
commit27c01c2db05c3cf8824975e50403cd4fd9356dca (patch)
tree5032c9b77971778c7e76722d0e86fa66a3a6dc1b /drivers/ide/ide-cd.c
parent08cd1dca00f7c84c8b30c2726e078529d4ebc93f (diff)
ide-cd: remove obsolete seek optimization
It doesn't make much sense nowadays and is problematic on some drives. Cc: Borislav Petkov <petkovbb@googlemail.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/ide-cd.c')
-rw-r--r--drivers/ide/ide-cd.c89
1 files changed, 6 insertions, 83 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 692fd4570df6..ea35e94d0980 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -774,52 +774,6 @@ static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
774 return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr); 774 return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
775} 775}
776 776
777#define IDECD_SEEK_THRESHOLD (1000) /* 1000 blocks */
778#define IDECD_SEEK_TIMER (5 * WAIT_MIN_SLEEP) /* 100 ms */
779#define IDECD_SEEK_TIMEOUT (2 * WAIT_CMD) /* 20 sec */
780
781static ide_startstop_t cdrom_seek_intr(ide_drive_t *drive)
782{
783 struct cdrom_info *info = drive->driver_data;
784 int stat;
785 static int retry = 10;
786
787 ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
788
789 if (cdrom_decode_status(drive, 0, &stat))
790 return ide_stopped;
791
792 drive->atapi_flags |= IDE_AFLAG_SEEKING;
793
794 if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {
795 if (--retry == 0)
796 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
797 }
798 return ide_stopped;
799}
800
801static void ide_cd_prepare_seek_request(ide_drive_t *drive, struct request *rq)
802{
803 sector_t frame = rq->sector;
804
805 ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
806
807 sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);
808
809 memset(rq->cmd, 0, BLK_MAX_CDB);
810 rq->cmd[0] = GPCMD_SEEK;
811 put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);
812
813 rq->timeout = ATAPI_WAIT_PC;
814}
815
816static ide_startstop_t cdrom_start_seek_continuation(ide_drive_t *drive)
817{
818 struct request *rq = drive->hwif->hwgroup->rq;
819
820 return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);
821}
822
823/* 777/*
824 * Fix up a possibly partially-processed request so that we can start it over 778 * Fix up a possibly partially-processed request so that we can start it over
825 * entirely, or even put it back on the request queue. 779 * entirely, or even put it back on the request queue.
@@ -1260,7 +1214,6 @@ static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
1260static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq, 1214static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
1261 sector_t block) 1215 sector_t block)
1262{ 1216{
1263 struct cdrom_info *info = drive->driver_data;
1264 ide_handler_t *fn; 1217 ide_handler_t *fn;
1265 int xferlen; 1218 int xferlen;
1266 1219
@@ -1270,44 +1223,14 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
1270 (unsigned long long)block); 1223 (unsigned long long)block);
1271 1224
1272 if (blk_fs_request(rq)) { 1225 if (blk_fs_request(rq)) {
1273 if (drive->atapi_flags & IDE_AFLAG_SEEKING) { 1226 xferlen = 32768;
1274 ide_hwif_t *hwif = drive->hwif; 1227 fn = cdrom_start_rw_cont;
1275 unsigned long elapsed = jiffies - info->start_seek;
1276 int stat = hwif->tp_ops->read_status(hwif);
1277
1278 if ((stat & ATA_DSC) != ATA_DSC) {
1279 if (elapsed < IDECD_SEEK_TIMEOUT) {
1280 ide_stall_queue(drive,
1281 IDECD_SEEK_TIMER);
1282 return ide_stopped;
1283 }
1284 printk(KERN_ERR PFX "%s: DSC timeout\n",
1285 drive->name);
1286 }
1287 drive->atapi_flags &= ~IDE_AFLAG_SEEKING;
1288 }
1289 if (rq_data_dir(rq) == READ &&
1290 IDE_LARGE_SEEK(info->last_block, block,
1291 IDECD_SEEK_THRESHOLD) &&
1292 (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)) {
1293 xferlen = 0;
1294 fn = cdrom_start_seek_continuation;
1295
1296 drive->dma = 0;
1297 info->start_seek = jiffies;
1298
1299 ide_cd_prepare_seek_request(drive, rq);
1300 } else {
1301 xferlen = 32768;
1302 fn = cdrom_start_rw_cont;
1303 1228
1304 if (cdrom_start_rw(drive, rq) == ide_stopped) 1229 if (cdrom_start_rw(drive, rq) == ide_stopped)
1305 return ide_stopped; 1230 return ide_stopped;
1306 1231
1307 if (ide_cd_prepare_rw_request(drive, rq) == ide_stopped) 1232 if (ide_cd_prepare_rw_request(drive, rq) == ide_stopped)
1308 return ide_stopped; 1233 return ide_stopped;
1309 }
1310 info->last_block = block;
1311 } else if (blk_sense_request(rq) || blk_pc_request(rq) || 1234 } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
1312 rq->cmd_type == REQ_TYPE_ATA_PC) { 1235 rq->cmd_type == REQ_TYPE_ATA_PC) {
1313 xferlen = rq->data_len; 1236 xferlen = rq->data_len;